Please note that all Alteil 1 US accounts will be considered Alteil Horizons accounts after the launch. Alteil 1 US cards will be fully playable after Horizons launch, however they may or may not be part of the Horizons Core set, and if they are not, their might be some limits on using them for balance purposes, such as in tournaments.

If you are unsure, cashing any rewards in after launch will guarantee cards/Starters/and pre-builts as part of the Alteil Horizons Core set.